:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #555555;
  --accent: #0066cc;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

main {
  max-width: 720px;
  padding: 2rem 1.25rem;
  margin: 0 auto;
}

header {
  margin-bottom: 2rem;
}

h1 {
  margin: 0;
  font-size: 2.2rem;
  font-weight: 700;
}

.subtitle {
  margin-top: 0.25rem;
  color: var(--muted);
}

nav {
  margin-top: 2.5rem;
  display: flex;
  gap: 1.25rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 1.25rem;
}